/*
 * Copyright (c) 2011, Nikolaus Moll
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the gradecalculator.net nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package net.gradecalculator.gui.qt.common.util;

public final class StringUtil {
	private StringUtil() {
	}
	
	public static boolean isDelimiter(final char c)
	{
		// check most frequent characters first
		if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
			return false; 
		}
		if (c >= '0' && c <= '9') {
			return false;	 
		}
		if (c == '.' || c == ',') {
			return false;	 
		}
		
		if ((c == ' ') || (c == '\n') || (c == '\t') || (c == '\r')) {
			return true;
		}

		return false;
	}
	
	public static String cleanString(final String text)
	{
		final StringBuilder result = new StringBuilder(text.length());
		
		boolean lastCharWasDelimiter = true;
		for (char c : text.toCharArray()) {
			final boolean currentCharIsDelimiter = isDelimiter(c);
			if (currentCharIsDelimiter) {
				if (!lastCharWasDelimiter) {
					result.append(' ');
					lastCharWasDelimiter = true;
				}
				continue;
			}
			
			lastCharWasDelimiter = false;
			result.append(c);
		}
		
		return result.toString().trim();
	}
}
